Rotatable transfer for metalworking machines



@ 719330 W. L. cLousE ROTATABLE TRANSFER FOR METAL WORKING MACHINES 3 Sheets-Sheet 3.

Filed Dec. 4, 1930 96h 1933' w. 1.. CLOUSE ROTATABLE TRANSFER FOR METAL WORKING MACHINES 3 Sheets-Sheet 2 Filed Dec. 4, 1930 mot/M0110.

W711. 460L686 mm Patented Oct. 31, 1933 UNITED STATES ROTATABLE TRANSFER FOR DIETAL- WORKING MACHINES William L. Clouse, Tiflln, Ohio, assignor to The National Machinery Company, Tiflln, Ohio Application December 4, 1930. Serial No. 500,073

19 Claims.

This invention relates to metal-working machines, such as cold headers of the multiple stroke type, and similar mechanisms.

Some kinds of work require two or more strokes by heading dies in order properly to shape the blank. It is essential that there be accurate registration of the parts during the successive strokes and that the blank be subjected to the action of difierently shaped dies in order to shape the blank progressively.

To meet the requirements some machines have been provided with means for moving a blank to position in the path of one heading die and then into the path of another heading die. Other machines have been devised wherein separate dies are mounted movabl-y on a heading slide and are slid successively to position for engagement with the work.

Both types of machines mentioned have been found objectionable in practice because it has been practically impossible to insure accurate placing of the dies relative to the work during the successive heading operations, and because of the prevention of desirable speed in operation by the slidable parts.

It is an object of the present invention to provide the heading slide of a cold header with a die carrier mounted for back and forth rotation and carrying separate dies adapted to be brought to proper active positions when the carrier reaches its respective extreme positions.

Another object is to provide simple and eflicient means for locking the carrier in its extreme positions thereby to insure accurate alinement of the dies with the work during the respective heading operations.

A still further object is to provide means for shifting the carrier during the reciprocation of the heading slide.

Another object is to so mount the die carrier as to hold it against side play and allow for desirable adjustments. With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings Figure 1 is a plan view of a heading machine, the slide of which is equipped with the present improvements.

Figure 2 is a section on line 22, Figure 1.

Figure 3 is a section on line 3-3, Figure 2.

Figure 4 is a section on line 44, Figure 1,

Figure 5 is a detail view of one heading die, showing a blank about to be shaped thereby.

Figure 6 is a similar view showing the first shaping of the blank.

Figure '7 is a view showing the blank shaped in the second heading die.

Referring to the figures by characters of reference, 1 designates the body of a cold header having any suitable means, 2, for holding a blank B in line with the longitudinal axis of a heading slide 3. The slide can be actuated by a pitman 4 receiving motion from a shaft 5 although it is to be understood that any desired operating means can be used. In the present structure motion is transmitted to a countershaft 6 by gears 7 for the purpose explained hereinafter.

The heading slide 3 is provided with an angular recess 8 in which is snugly fitted a block 9 having a deep bore 10. The block can be adjusted longitudinally within the recess by means of a wedge 11 or other suitable means.

The die carrier includes a plate 12 having a stem 13 which has a tight working fit in the bore 10. The block 9 provides a broad bearing surface for receiving thrust from the plate 12 and for supplementing the stem 13 as a means for holding the plate against radial displacement.

Suitably connected to the plate 12 are separate heading dies 14 and 15 either of which is adapted to be moved by the plate 12 to a position concentric with the central longitudinal axis of the slide 3. A lug 16 can be extended from the margin of the plate for engagement with either of two stops 1'7 and 18 on the slide at which time one or the other of the dies will be centered for engagement with the held blank.

A radial groove 19 is formed in one face of plate 12 and has a slide 20 therein. An arm 21 is pivotally connected to this slide and radiates from a rock shaft 22 which extends under and is carried by the heading slide. Another arm 23 extends from shaft 22 and has a universal connection with a rod 24 which, in turn, is connected by a universal joint to an arm 25 extending at an angle from a cross head 26. This cross head, which is fulcrumed at 27, has spaced levers 28 fulcrumed thereon.

Rollers 29 are carried by the levers at one end and a spring 30 can be interposed between the other ends of the levers for holding the rollers pressed into operative relation with one or more cams 31. Fingers 32 can be extended from the levers for engagement with a stop 33 on the crosshead, thereby to limit the movement of the rollers toward each other.

Cam or cams 31 are rotatable with a shaft 34 which receives motion through gears 35 from countershaft 6.

It is to be understood that any desired mechanism can be substituted for that shown and described whereby rotary motion of shaft 34 is converted nto a rocking motion of shaft 22. In the structure illustrated the cam 31 will actuate the levers 28 which are normally restrained by spring 30. Thus crosshead 26 will be rocked and reciprocate the parts connected thereto.

The mechanism is all so timed that before the slide completes every forward or heading stroke the shaft 22 and the parts controlled thereby will have been moved to one or the other of their extreme positions. Let it be assumed that the die 14 is advancing in the position shown in Figure 2 so as to engage the blank and initially shape it. At this time the lug 16 is pressed against stop 18 where it is held by arm 21. It will be noted that the axis of shaft 22 and the center of the connection between slide 20 and arm 21 are in a line substantially perpendicular to the longitudinal center of groove 19. Consequently these parts act as a lock to hold the plate 12 against rotation.

As the heading slide moves back and then again advances the cross head 26 will be actuated to rock shaft 22 and cause arm 21 to swing in a counterclockwise direction in Figure 4. Thus slide 20 will move along groove 19 until lug 16 is brought against stop 17 whereupon the parts will be locked with die 15 in heading position. Two successive blows by different dies can therefore be given to the blank during the completion of two successive advance strokes of the heading slide and each time the dies will be held positively and firmly in correct position for shaping. In order that the arm 21 can be held immovably as the die quickly advances its short distance to the held work, the cam 31 can be so shaped as to hold the rollers 29 against movement during the proper time intervals. For example the cam can be provided with opposed working portions concentric with its shaft so that there will be no actuation of the arm 21 until after the work has been shaped and released.

By providing a rotatable die carrier as herein described, the operation will be materially accelerated and the work will be produced with a better finish than heretofore due to the means for positively locking the dies while heading, and the extensive bearing means provided for the die carrier.

The arm 21 and its slide 20 with the slotted portion 19 of carrier 12 provide in effect a toggle action which not only accelerates the motion but prevents pounding when the carrier 12 is brought to each limit of its movement by gradually stopping the carrier due to the fact that the speed of rotation of the carrier 12 will be reduced in proportion to the widening of the angle between arm 21 and slot 19.

By means of wedge 11 the block 9 and the die carrier can be adjusted or advanced relative to the heading slide without disturbing the operating means.

The term heading slide as herein used applies to any slide carrying dies for heading, forging, or otherwise shaping articles under pressure.

What is claimed is:

1. A machine of the class described including a heading slide, a carrier mounted for back and forth rotation thereon, separate heading dies on the carrier, and means operating in timed relation with the slide for oscillating the carrier about its axis of rotation to bring the respective dies to heading position during successive heading strokes of the slide.

2. A machine of the class described including rjesasec a heading slide, a carrier mounted for back and forth rotation thereon, separate heading dies on the carrier, and means operating in timed relation with the slide for oscillating the carrier about its axis of rotation to bring the respective dies to heading position during the successive heading strokes of the slide, said means holding the carrier in either of two positions while the slide is at its advanced or heading position.

3. The combination with a work holder, of a slide, a carrier mounted for back and forth rotation at that end of the slide nearest the work holder, separate dies on the carrier, and means for oscillating the carrier during the operation of the slide to position the dies for successive engagement with the held work.

4. The combination with a work holder, of a heading slide, a carrier mounted for limited back and forth rotation on the slide, separates dies on the carrier adapted to successively aline with the work when the carrier is rotated to its respective extreme positions, and means for holding the carrier at either of said extreme positions.

5. The combination with a work holder, of a heading slide, a carrier mounted thereon for limited back and forth rotation, separate dies on the carrier adapted to successively aline with the work when the carrier is rotated to its respective extreme positions, and means for shifting the carrier about its axis of rotation and holding it in either of its extreme positions.

6. The combination with a work holder, of a slide, a carrier mounted for limited back and forth rotation on the slide, separate dies on the carrier adapted to successively aline with the work when the carrier is rotated to its respective extreme positions, and means for holding the carrier at either of said extreme positions, said means including a rock shaft, an arm carried thereby, and a slidable and pivotal connection between the arm and carrier.

7. The combination with a heading slide, of separate heading dies mounted to swing back and forth in unison thereon about a common axis, means for limiting said swinging movement, and die actuating means for holding the dies againstfree retrograde movement when stopped by either of said limiting means.

8. The combination with a heading slide, of a member adjustably carried by the slide, and a die carrier mounted for back and forth rotation on and adapted to thrust against said member.

9. The combination with a heading slide, of a bearing member carried thereby, a die carrier thrusting against and rotatable back and forth relative to said member, and a stem on the carrier bearing within the member.

10. The combination with a heading slide, of a bearing member carried thereby, a die carrier thrusting against and rotatable back and forth relative to said'member, and a stem on the carrier bearing within the member, said member being adjustable in the slide.

11. The combination with a heading slide, of a die carrier carried thereby and rotatable back and forth relative thereto, separate dies on the carrier, and means for shifting the carrier during the operation of the slide to bring the respective dies successively into line with the central axis of the slide.

12. The combination with a heading slide, of a die carrier carried thereby and rotatable back and forth relative thereto, separate dies on the carrier, a means for shifting the carrier during the operation of the slide to bring the respective dies successively into line with the central axis of the slide, and a stop for the carrier, at each limit of its movement, said shifting means constituting means for holding the carrier against either of the stops. 1

13. The combination with a work holder, of a slide, a carrier mounted for limited back and forth rotation on the slide, separate dies on the carrier adapted to successively aline with the work when the carrier is rotated to its respective extreme positions, and means for holding the carrier at either oi saidextreme positions, said-means including a rock shaft, an arm carried thereby, and a working connection between the arm and the carrier.

14. The combination with a work holder, of a slide, a carrier mounted for limited back and forth rotation on the slide, separate dies on the carrier adapted to successively aline with the work when the carrier is rotated to its respective extreme positions, and means for holding the carrier at either 'of said extreme positions, said means including a rock shaft, an arm carried thereby, and a working connection between the arm and the carrier, said arm being in a dead center position when the carrier is in either extreme position.

15. The combination with a heading slide, a

carrier mounted for limited back and forth rotation thereon, and dies on the carrier, of means for rotating the carrier away from each limit of its movement and stopping it gradually upon reaching the other-limit of its movement, said means including a rock shaft'and a toggle connection between the shaft and carrier. I

16. The combination with-a heading slide, a

carrier mounted for limited back and forth rotation thereon, and dies on the carrier, of means for rotating the carrier away from each limit of its movement and stopping it gradually upon reaching the other limit-of its movement, said means including a rock shaft, an arm thereon, and a sliding connection between the arm and carrier.

for rota ing the carrier away from each limit of its movement and stopping it gradually upon reaching the other limit of its movement, said means including a rock shaft rotatable about an axis parallel with the axis of rotation of the carrier, and relatively movable oscillating means for transmitting motion from the shaft to the carrier, said means being movable to such angles relative to each other so as to hold the carrier at either limit of its movement.

18. The combination with a heading slide, a carrier thereon mounted for back and forth rotation, dies on the carrier, and cooperating means movable to either of two substantially right-angle positions for shifting the carrier to either of two extreme positions and holding it in said position.

19. In a metal morking machine a heading slide, separate dies carried thereby, means for oscillating the dies relative to the slide to bring them successively into alinement with the work, and means on the slide cooperating with the die oscillating means for holding the alined die positively and accurately in alined position prior to and during its engagement with the work.

' WILLIAM L. CLOUSE. 

